/Engine/Source/Runtime/Engine/Classes/Engine/AssetManager.h
For a given package and platform, return what Chunks it should be assigned to, games can override this as needed. Returns false if no information found
virtual bool GetPackageChunkIds ( [FName](API\Runtime\Core\UObject\FName) PackageName, const class [ITargetPlatform](API\Developer\TargetPlatform\Interfaces\ITargetPlatform) * TargetPlatform, [TArrayView](API\Runtime\Core\Containers\TArrayView)< const int32 > ExistingChunkList, [TArray](API\Runtime\Core\Containers\TArray)< int32 > & OutChunkList, [TArray](API\Runtime\Core\Containers\TArray)< int32 > * OutOverrideChunkList ) const